Sublime unit testing

test.py

import sublime
import sys
from unittest import TestCase

class TestNegateSentence(TestCase):
  def setUp(self):
    self.view = sublime.active_window().new_file()
    # make sure we have a window to work with
    s = sublime.load_settings("Preferences.sublime-settings")
    s.set("close_windows_when_empty", False)

  def tearDown(self):
    if self.view:
      self.view.set_scratch(True)
      self.view.window().focus_view(self.view)
      self.view.window().run_command("close_file")

  def test_negate_is(self):
    self.check_substitution('"The dog is black"', '"The dog is not black"')

  def check_substitution(self, input, expected):
    self.set_text(input)
    self.view.run_command("negate_sentence")
    self.assertEqual(self.get_text(), expected)
    

  def set_text(self, string):
    self.view.run_command("insert", {"characters": string})

  def get_text(self):
    return self.view.substr(self.view.line(self.view.text_point(0, 0)))

  def move_cursor(self, position):
    pt = self.view.text_point(0, position)

    self.view.sel().clear()
    self.view.sel().add(sublime.Region(pt))